Answer

Yes. In the Apple Watch app on your phone there’s an area to add watches and there’s a setting that Yes. In the Apple Watch app on your phone there’s an area to add watches and there’s a setting that lets you set it to auto detect which one you are using by when you pick up the watch.
I have 2 watches and whichever one I pick up to wear the app knows.
I wear my older one if I’m going to be in a rough environment so as not to damage my newest one.

Apple Watch Series 3 has a water resistance rating of 50 metres under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or ocean. However, Apple Watch Series 3 should not be used for scuba diving, waterskiing, or other activities involving high-velocity water or submersion below shallow depth.

Some straps are sold separately. Some features are not available in all regions or all languages.

To learn more about wearing Apple Watch, getting a good fit, potential skin sensitivity, and proper care and cleaning, click here.